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Investigate the Coarse Aggregate to Obtain the Result

62 Table 5.6 The Result of Slump Test at 14 days and 28 days Varian Slump Value 14 days Slump Value 28 days Metakaolin : Silica Fume cm 75:5 50:5 25:10 2 The differences value in the experiment is because the amount of additional water to make the mixture is easy to be done. If the amount of additional water is high the mixture will be too wet and the value of the test will be higher.

5.3. Weight Density of Concrete

The types of concrete can be grouped based on the weight of the concrete type. Concrete grouping based on its density can be seen in Table 5.7. Tabel 5.7 Specification of Weight Density of Concrete Type Weight Density grcm 3 Usage Very Lightweight Concrete 1,00 Non Struktur Lightweight Concrete 1,00-2,00 Lightweight Structure Normal Concrete 2,30-2,50 Structure Weight Concrete 3,00 Light shield Source: Tjokrodimuljo, 1992 63 In this research, the age of the concrete is divided into two types; 14 days and 28 days. In day 14, the highest value of the density is in the percentage of both metakaolin and silica fume as much as 25:5. The value is 1.9519 grcm 3 . The complete value can be seen in Table 5.8 and the chart can be seen in Figure 5.1. Tabel 5.8 Average Weight Density in 14 days Pozzolan Weight Density grcm 3 Average of Weight Density grcm 3 Metakaolin : Silica Fume 25:5 1.9757 1.9519 1.9381 1.9419 50:5 1.8706 1.8974 1.8929 1.9288 75:5 1.7608 1.7176 1.6988 1.6932 Figure 5.1 Weight Density in 14 Days Chart 1,6000 1,6500 1,7000 1,7500 1,8000 1,8500 1,9000 1,9500 2,0000 25:5 50:5 75:5 W e ig h t D e n si ty g r cm 3 Precentage of Metakaolin and Silica Fume 14 days 64 In day 28, the highest value of the density is in the percentage of both metakaolin and silica fume as much as 25:5. The value is 1.9287 grcm 3 . The complete value can be seen in Table 5.9 and the chart can be seen in Figure 5.2. Tabel 5.9 Average Weight Density in 28 days Pozzolan Weight Density grcm 3 Average of Weight Density grcm 3 Metakaolin : Silica Fume 25:5 1.8616 1.9287 1.9902 1.9344 50:5 1.7159 1.8051 1.8512 1.8483 75:5 1.6783 1.6939 1.7351 1.6683 Figure 5.2 Weight Density in 28 Days Chart 1,5500 1,6000 1,6500 1,7000 1,7500 1,8000 1,8500 1,9000 1,9500 25:5 50:5 75:5 W e ig h t D e n si ty g r cm 3 Precentage of Metakaolin and Silica Fume 28 days

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